Finance
Vendor Invoice Processing SOP Template
Missed vendor invoices damage supplier relationships. Duplicate payments cost money you don't notice until the audit. And when AP lives in one person's email inbox with no documented process, every vacation, sick day, or staff change creates a payment gap. A documented invoice processing SOP doesn't just prevent errors — it makes the accounts payable function auditable and transferable.
This SOP covers the complete vendor invoice lifecycle from receipt to payment and filing. It applies to any accounting software (QuickBooks, Xero, NetSuite, FreshBooks) and takes about 10 minutes per invoice when the process is followed consistently.
Time to complete
~10 min/invoice
Owner
Finance / AP
Frequency
Per invoice
What You'll Need
- Accounting software login (QuickBooks, Xero, NetSuite, etc.)
- Your approved vendor list with contract or PO on file
- Access to the original purchase order (PO) or contract for the vendor
- Approval authority contact (manager or CFO depending on amount)
- Vendor payment details on file (bank account, PayPal, etc.)
The SOP
Receive and log the invoice
When an invoice arrives (email, mail, or vendor portal), log it in your AP tracker immediately with: invoice number, vendor name, invoice date, due date, and amount. Mark it as "Received — Pending Review." Invoices that don't get logged immediately get lost in inboxes and paid late.
Verify the vendor and PO match
Confirm three things: (a) the vendor is on your approved vendor list, (b) the invoice references a valid PO or contract number, and (c) the services or goods billed match what was ordered. If anything doesn't match, flag the invoice for clarification before entering it — paying an incorrect invoice is harder to reverse than catching it here.
Check the amount against the contract or quote
Compare the invoiced amount against the agreed price in the contract, SOW, or approved quote. Check for unexpected line items, rate changes, or quantity discrepancies. If the amount is within the agreed scope, proceed. If not, send a discrepancy email to the vendor before entering the invoice — do not process and "sort it out later."
Enter the invoice into your accounting software
Create a new bill or invoice entry in your accounting software with: vendor name, invoice number, invoice date, due date, amount, and correct expense account/GL code. Attach the original invoice PDF. Verify the payment terms match (Net 30, Net 60, etc.). Accurate GL coding is critical — miscoded invoices corrupt your financial reporting.
Route to the appropriate approver
Send the invoice for approval according to your approval authority matrix (e.g., under $1,000 → department manager; $1,000–$10,000 → Director; over $10,000 → CFO). Include the invoice PDF and a one-line summary of what it's for. Set a follow-up reminder for 48 hours if no response — approvals stuck in inboxes delay payments past due dates.
Schedule payment per net terms
Once approved, schedule the payment in your accounting software to process 2–3 business days before the due date (to account for bank processing time). Confirm the vendor's payment details match what's on file. Send payment via your agreed method (ACH, wire, check, etc.) and record the payment date and confirmation number in the AP tracker.
File the invoice in the vendor folder
After payment is confirmed, save the invoice PDF to the vendor's folder in your shared storage with a date-stamped name (e.g., VendorName_2026-04-03_INV-1042.pdf). Update the AP tracker status to "Paid." This archive is your source of truth for vendor spend, audits, and payment dispute resolution.
Pro Tips
- Process invoices on a set schedule (e.g., every Monday and Thursday) rather than ad hoc. Batch processing is faster and reduces the chance of invoices aging past their due date unnoticed.
- Never pay an invoice that hasn't been entered into your accounting system. Even urgent vendor requests should go through the full process — "I'll add it later" leads to duplicate payments and uncategorized spend.
- Set up two-person authorization for payments over your threshold (typically $5,000–$10,000 for small businesses). It's the simplest fraud prevention control in AP.
Record this SOP with Claudia
Process an invoice in your accounting software while Claudia records. The SOP can then be run by any finance team member or trained VA — consistently, every time.
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